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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Detail Report for Interference on Chinese Medical Bands Date Submitted: Jan 10, 2013 Source: Ning Li , BUPT; Liang Li, Vinno ; Tul Shui , Lin Zhang, Sen Li, Guang -Long Du, BUPT

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:Detail Report for Interference on Chinese Medical Bands Date Submitted: Jan 10, 2013 Source: Ning Li , BUPT; Liang Li, Vinno; TulShui, Lin Zhang, Sen Li, Guang-Long Du, BUPT Suite 202, Building D, No.2 Xinxi Lu, Beijing, China, Voice: 1-914-333-9687, FAX: 1-914-332-0615, E-Mail: liangli@vinnotech.com Abstract: Opening report for TG4n(MBAN) Task Group Purpose: Outline accomplishments from the March 2012 meeting and planned tasks for this meeting. Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Liang Li Vinno

  2. INDEX • Interference Descriptions on Each Band • The Math Models • Model of Digital TV (CBMM) • Model for Wireless Microphone • Model of Digital Phone (Walkie-talkie)

  3. Interference Descriptions on Each Band • The Math Models • Model of Digital TV (CBMM) • Model for Wireless Microphone • Model of Digital Phone (Walkie-talkie)

  4. The usage on 174-216MHz Band

  5. VHF Radio and TV The Usage on174-216MHz band

  6. Wireless Microphone The Usage on174-216MHz band Wireless Microphones on the market: On Chinese Markets, More China's wireless microphones shifts from VHF to UHF(most 500-900MHz), especially in the high-end products.

  7. The Usage on174-216MHz band Wireless Microphone Operation frequency 189.9-216MHz, Pt <10mW , Bandwidth<200kHz. But, there is no rule about PSD of wireless microphone in china ,so we refer bandwidth mask in America and Europe.

  8. The Usage on 407-425MHz band

  9. The Usage on407-425MHz band • Interphone (Walkie-talkie)

  10. The Usage on407-425MHz band • Interphone (Walkie-talkie) • DMR ： • 4CPFSK ， TDMA，B=12.5kHz • DPMR ： • 4FSK ， FDMA，B=6.25kHz

  11. The Usage on 407-425MHz band Operation frequency and channel bandwidth (section 8.8.1) Modulation parameters (Narrow Band PHY,420-450MHz) (Section 8.1.2) IEEE 802.15.6 devices（Potential ）

  12. The Usage on 407-425MHz band IEEE 802.15.6 devices（ Potential ） The transmit spectral mask for narrow band PHY is : (Section 8.8.1)

  13. The Usage on 608-630MHz band

  14. UHF Radio and TV The Usage on 608-630MHz band

  15. The Usage on 608-630MHz band WMTS Standard（Potential） • WMTS :Wireless Medical Telemetry • WMTS devicesneed to get the FCC authorization to product and wedon`t find this device using in China yet.

  16. The Usage of 608-630MHz General Wireless Remote Control Devices • General wireless remote control • devices on the market mainly • refers to the radio remote control • (RF Remote Control). • It has been widely used in garage • door ,electric gate, Barrier remote • control, burglar alarm, industrial • control and wireless intelligent • home field.

  17. Most of the wireless remote control operation frequency in the Chinese market is in the 315MHz and 433MHz. The Usage of 608-630MHz • General Wireless Remote Control Devices • operation frequency :470-566MHz，614-787MHz • Pt: <5mW(e.r.p) • channel bandwidth : <1MHz • Modulation： No specified . There are different • modulations in varied products , FSK or ASK for example.

  18. Interference Summary

  19. Interference Descriptions on Each Band • The Math Models • Model of Digital TV (CBMM) • Model for Wireless Microphone • Model of Digital Phone (Walkie-talkie)

  20. Model of Digital TV (CBMM) (1) • CBMM Interference Models • Bandwidth for CMMB signal is 8MHz • BPSK, QPSK and16QAM modulation, OFDM technology with 4096 sub-carrier (3076 been used) • It is feasible to use the white Gaussian noise to simulate the digital TV signal. Right figure: Power Spectrum Density (PSD) of CMMB signal (in QPSK modulation scheme). L. Li, Vinno; W. X. Zou, BUPT; G. L. Du, BUPT

  21. Model of Digital TV (CBMM) (2) Interference scenario SIR calculation result with different distance between 4n devices the 4n device is assumed in 19m high, or floor 5 ~ floor 6. In the figure: d1: distance between 4n transmitter and 4n receiver; d2: distance between 4n devices and the CMMB base station; hm: the height of 4n devices for ground; hs: the height of CMMB base station; L. Li, Vinno; W. X. Zou, BUPT; G. L. Du, BUPT

  22. Model of Digital TV (CBMM) (3) • The interference math model is as: IC=Am×[h*xC(t)] • So the interference power is estimated as Picbmm=1kW×f(d)×Br≈1kW×d-2×0.25=54-20log10(d) dBm • Where f(d)≈d-2 is path loss factor, and d is the distance to CBMM base station (m); Br=2MHz/8MHz=0.25is relatively bandwidth factor; • So the amplitude of interference signal is Am=Picbmm1/2 L. Li, Vinno; W. X. Zou, BUPT; G. L. Du, BUPT

  23. Interference Descriptions on Each Band • The Math Models • Model of Digital TV (CBMM) • Model for Wireless Microphone • Model of Digital Phone (Walkie-talkie)

  24. Model for Wireless Microphone(1) • Operation Modes • Transmission Signal : sound signal : amplitude (0.3 in this modulation) : carrier frequency (200MHz in this modulation) : frequency deviation Liang Li Vinno

  25. Model for Wireless Microphone(2) Liang Li Vinno

  26. Model for Wireless Microphone(3) • Spectrum analysis and verification Soft speaker Silent mode As it is seen in the three spectrum figure, 200kHz around the Fc, the signal decays at least 25dB. And beyond 500kHz around Fc, the decay is 30dB at least. Loud speaker Liang Li Vinno

  27. Model for Wireless Microphone(4) Spectrum analysis and verification FCC requirements: • Frequency bands: 174-216, 470-608, 614-806 MHz • Maximum transmit power: 50 mW (VHF), 250 mW (UHF), Most units operate with 10-50 mW output • Occupied bandwidth: 200 kHz or less By the comparison and analysis, the model for WM meets the FCC requirements. Liang Li Vinno

  28. Interference Descriptions on Each Band • The Math Models • Model of Digital TV (CBMM) • Model for Wireless Microphone • Model of Digital Phone (Walkie-talkie)

  29. Model of Digital Phone (Walkie-talkie)(1) • Simulation Models • This baseband data is based on frame format which set by DPMR standard. Liang Li Vinno

  30. Model of Digital Phone (Walkie-talkie)(2) • Math Model • X(t) is the baseband sigal though the 4FSK. • each of the four information bits is mapping with a cosine signal as is 4FSK deviation in the above figure, is selectd as 30KHz here according to the DPMR standard.

  31. Figure1 is the data sequences before the 4FSK and figure 2 is the signal sequences through the 4FSK. The data sequences we simulate is 01 01 11 01..., based on the corresponding relation from the mapping figure in previous page ,the signal sequences through the 4FSK which is x(t) actually,is shown in figure 2. Liang Li Vinno

  32. Results • In this figure, this is the emission signals.The emission signals is simulate by the formula ,the is signal sequences through the 4FSK, is selected as 409.9MHz. Liang Li Vinno

  33. Conclusion and Further works • TBD

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